Tool-socket.



L. GREGSON.

TOOL SOCKET. APPLICATION FILED MAY 17,1909.

Patented 0011.4, 1910.

UNITED ATES PATENT OFFICE.

LEWIS GREGSDN, OF NEW BEDFORD, MASSACHUSETTS, ASSIG-NOR TO MORSE TWIST DRILL & MACHINE COMPANY, OF NEW BEDFORD, MASSACHUSETTS.

TOOL-SOCKET.

Specification of Letters Patent.

Application filed May 17, 1909. Serial No. 496,399.

To all tuhom it may concern:

Be it known that I, LEwIs GREcsoN, a citizen of the United States, and a resident of New Bedford, in the county of Bristol,

the tool and socket without subjecting the shank to the liability of breaking under torsional strain.

I have invented a new twist drill formed of a four-sided strip of tool-steel, such as tungsten-steel, having a cross-section thinner at the middle than at the edges thereof, a part of the strip being twisted to form the drill and the remainder left flat to form the tion inasmuch as the same forms the subject matter of my application Serial No. 496,398 filed simultaneonsly herewith.

In the drawings which accom any and form a part of the present speci cation, I have shown one embodiment of my invention which has given good results in practice; but it will be understood that many modifications may be made therein without de arting from the spirit of my invent-ion.

*igure 1 is a side View of a drill and socket made in accordance with my invention. Fig. 2 is a longitudinal section of the drill and socket shown in Fig. 1, and Fig. 3 is a cross-section taken on the line 33 of Fig. 1.

In the drawings selected for more fully describing my invention, 1 represents a twist dril a strip of produced by twistin metal, the cross-section of which is thinner at the middle than at the ends, as indicated at 2 which represents the shank of said drill. 3 is a sleeve slotted at 4: throughout a portion of its length to form the two 0 positelyarranged and longitudinally-extending jaws 5 5, each of which is provided at its forward end with a projection 6. Each jaw is beveled as shown most clearly in Fig. 3 to take the four-sided grooved shank 2, the points 7 7 of each jaw coiiperating with the thinnest portion of the shank 2. The jaws 5 5 of the sleeve may conveniently be formed by a swaging tool of appropriate shape.

In Figs. 1 and 2 the shank is shown as-inserted only part way into the slot 4:,so that the interior construction may be more read ily seen, but it will be understood that in operation the end of the shank rests against the rear wall of the slot.

The rear end of the sleeve may be pro vided with a tang 8 which fits into .a transverse slot 11 passing through the socket 9. The function of this tang however is merely to afford a means for facilitating the read removal of the sleeve from the socket and it is not intended as a drive for the drill. The outer walls of the sleeve are tapered throughout a portion of their length so as to Patented Oct. 4;, 1910. 1

Closely tit the socket 9, and the projections ti, 6, on the forward end of the sleeve take the shank of any strain that otherwise would be caused by friction between it and the socket.

In operation, the drill shank is first inserted between the jaws of the sleeve through to the end of the slot 4, the jaws by their elasticity firmly holding the shank, and the shank is then inserted in-t-he sleeve so that the projections 6, 6 engage the recesses 10, 10, respectively.v It will be understood that by providin means for holding a drill having a groove shank, I am enabled greatly to cheapen the cost of such drills,- inasmuch as the latter need not he provided with permanent shanks of circular section, and that by roviding a drive at the forward portion oi the shank instead of employing the usual rearwardl situated tang, I greatly decrease the liabi ity of breaking the shank when the latter is subjected to severe torsional strain.

Icla'ini:

1. In combination, a socket for a rotating cutting-tool provided with two, opposltely disposed recesses in the forward end thereof, a sleeve arranged within said socket said sleeve being slotted throughout a portion of its length to form two oppositely-disposed longitndinally-extending jaws constructed to receive thenon-circular shank of a cutting-tool, and. a projection on the forward end of each of said aws fitting into one of said recesses. v I

2. In combination, a socket for a rotating cutting-tool provided with two oppositelydisposed recesses in the forward end thereof, a sleeve arranged within said socket, said sleeve being slotted throughout a portion of its length to form two oppositely-disposed longitudinally-extending jaws beveled to receive a shank having a cross-section thinner at the middle than at the edges thereof and a projection on the .forward end of each of said jaws fitting into one of said recesses.

In testimony whereof, I have hereunto subscribed my name this 13th day of May 1909.

LEWIS GREGSON. 

